May payouts are still processing. I just received a claim button on most of my Rewards yesterday and am still waiting for one. I think Brave is trying to address all the past unresolved payout issues that are still outstanding with the May payout processing. So, just wait until payments are complete, then if you are still experiencing a payout problem, update your post and tag the moderators.
Keep checking the Brave Ads Payout status update and when you see your specific wallet status change to a red dot, then payout processing is complete.